N-substituted piperidine derivatives, process for preparing the same and their use as stabilizers

ABSTRACT

A synthetic polymer composition stabilized against photo- and thermal deterioration is disclosed. The stabilization is obtained by incorporating in the composition an effective amount of defined N-substituted piperidine derivatives.

Murayama et al.

N-SUBSTITUTED PIPERIDINE DERIVATIVES, PROCESS FOR PREPARING THE SAME AND THEIR USE AS STABILIZERS Assignee: Sankyo Company Limited, Tokyo,

Japan Filed: Nov. 27, 1972 Appl. No.: 309,891

Related Application Data Division of Ser. No. 229,203, Feb. 24, 1972,

abandoned.

Foreign Application Priority Data Nov. 13, l97l Japan 46-90988 Oct. 1, 1974 [52] CI.260/45.8 NZ, 260/77.5 SS, 260/293.66.

[51] Int. Cl. C08f 45/60, C08g 51/60 [58] Field of Search 260/458 NZ, 293.66

[56] References Cited 7 UNITED STATES PATENTS 3,640,928 2/l972 Murayama et a1 260/23 3,692,778 9/1972 Murayama et al.....' 260/293.66

OTHER PUBLICATIONS Denss et a1, Chem. Abs., Vol. .71, 1969, ll3003N.

Primary ExaminerM. 1. Welsh Assistant ExaminerR. A. White Attorney, Agent, or Firm-Toren and McGeady [57] ABSTRACT A synthetic polymer composition stabilized against photoand thermal deterioration is disclosed. The stabilization is obtained by incorporating in the composition an effective amount of defined N-substituted piperidine derivatives.

11 Claims, N0 Drawings l N-SUBSTITUTED PIPERIDINE DERIVATIVES, PROCESS FOR PREPARING THE SAME AND THEIR USE AS STABILIZERS This is a division of abandoned application Ser. No. 229,203 filed Feb. 24, 1972.

This invention relates to new N-substituted piperidine derivatives, their preparation and their use as stabilizers.

More particularly, this invention is concerned with the N-subtituted piperidine derivatives having the for mula H3C L CH; me f on;

wherein R represents an alkyl group, an alkenyl group,

. an alkynyl group, an aralkyl group, B-hydroxyethyl group or the group of the formula in which R represents an alkyl group, an alkenyl group or an aryl group; and R represents an alkylene group having 2 or 3 carbon atoms, o-phenylene group or the group of the formula in which R, is as defined above and n is an integer of 4 through 6 inclusive, a process for the preparation of the N-substituted piperidine derivatives (1) and stabilization of synthetic polymers against photoand thermal-deterioration thereof by having incorporated therein, in a sufficient amount to prevent such deterioration, at least one of the N- substituted piperidine derivatives (I).

In the above formula(! the alkyl group may illustratively be those alkyl groups having one to eight carbon atoms, e.g., methyl, ethyl, pr'opyl, butyl, hexyl, heptyl and octyl; the alkenyl group be those alkenyl groups having three to five carbon atoms, e.g., allyl, Z-butenyl and 2-pentenyl; the alkynyl group be those alkynyl groups having three to five carbon atoms, e.g., 2- propynyl; the aralkyl group be those aralkyl groups which have six to 10 carbon atoms in the aryl moiety and one to three carbon atoms in the alkyl moiety ad optionally, as a substituent in the aryl moiety, such as lower alkyl, e.g., methyl, ethyl and propyl, halogen, e.g., chlorine, bromine and fluorine and the like, for example, benzyl, phenethyl, naphthylmethyl; the aryl group be those aryl groups having six to l carbon atoms, e.g., phenyl and naphthyl; the alkylene group be ethylene, propylene and trimethylene. I I

The term synthetic polymer" as used herein are intended to embrace polyolefins including homopolymers of olefins such as low-density and high-density polyethylene, polypropylene, polystyrene, polybutadiene, polyisoprene and the like,'and copolymers of olefins with other ethylenically unsaturated monomers such as ethylene-propylene copolymer, ethylene-butene copolymer, ethylenevinyl acetate copolymer, styrene-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer and the like;

polyvinyl chlorides and polyvinylidene chlorides including homopolymer of each of vinyl chloride and vinylidene chloride, vinyl chloride-vinylidene chloride copolymer and copolymers of each of vinyl chloride and vinylidene chloride with vinyl acetate or other ethylenically unsaturated monomers; polyacetals such as polyoxymethylene and polyoxyethylene; polyesters such as polyethylene terephthalate; polyamides such as 6-nylon, ,6,6-nylon and 6,10-nylon; and polyurethanes.

Synthetic polymers have been widely utilized in the art, in view of their excellent properties, in various forms or shapes, for example, filament, fibre, yarn, film, sheet, other molded article, latex and foam. However, these polymers have some drawbacks such as poor lightand heat-stabilities and the like. Stated illustratively, polyolefins and polyurethane elastomers frequently tend to undergo severe deterioration when exposed to light such as sunlight or ultraviolet ray, and polyvinyl chloride and polyvinylidene chloride frequently tend to deteriorate and become colored by the action of light and heat together with elimination of hydrogen chloride therefrom. Polyamides are also frequently subjected to photo-deterioration. For the purpose of stabilizing these synthetic polymers against I such deterioration, there have heretofore been pro- As a result of our extensive studies, it has now been found that the new N-substituted piperidine derivatives (1) of this invention can be satisfactorily prepared and exhibit a high stabilizing effect against photoand thermal-deterioration of the synthetic polymers.

It is, accordingly, an object of this invention to provide new and useful N-substituted piperidine derivatives (l).

Another object is to provide a process for the preparation of the valuable N-substituted piperidine derivatives (l).

Still another object is to provide synthetic polymer composition stabilized against the deterioration thereof by havingincorporated therein a sufficient amount to prevent the deterioration of at least one of the N- substituted piperidine derivatives (1).

Other objects'of this invention will become apparent to those skilled in the art from the following description.

In one aspect of this invention, the N-substituted piperidine derivatives (I) are all new substances unknown in the .art.

The N-substituted piperidine derivatives (I) of this invention include the four groups of N-substituted piperidine compounds having the following formulae (l-a), (l-b), (I-c) and (I-d): 7

2Q H3C m CH3 Hao f o11 wherein R represents an alkyl group, an alkenyl group, an alkynyl group or an aralkyl group; and R represents an alkylene group having two or three carbon atoms; o-phenylene group or the group of the formula on; em

(CH2) N Rk on, ,,i-o

CH3 CH3 in which R; is as defined above and n is an integer of 4 through 6 inclusive;

, wherein'R represents an alkyl group; and R represents e g on; 1

' i in which R is as defined above and n is an integer of 4 through 6 inclusive;

wherein R represents an alkylene group having two or three carbon atoms, o-phenylene group or the group of the formula in which n is an integer of 4 through 6 inclusive; and

f 0 t o Hi0 N CH3 wherein R represents an alkyl group, an alkenyl group, or an aryl group; and R represents an alkylene group having two or three carbon atoms; o-phenylene group or the group of the formula CH3 om in which R,; is as defined abovevand n is an integer of 4 through 6 inclusive.

Representative of the N-substituted piperidine compounds of the above-illustrated formulae (I-a), (I-b),

(l-r') and (l-zl) are as follows:

Com-

Chemical Name pound 000 l@ MAMIJ- 8-aza-7,7,8,9,9-pentarnethyl-l,4-dioxa-spiro-[4.5]decane. 8-aza-2,7.7.8,9,9-hexamethyl-l ,4-dioxa-spiro-[45 ]decane. 9-aza-8,8,9,IOJO-pentamethyl-l ,S-dioxa-sp'iro-ISJ ]unde'cane. 8-aza-7,7,9,9-tetramethyl-8-octyl-l ,4-dioxa-spiro-[45 ]decane.- S-aza-8-(fihydroxyethyl )-7 .7,9,9-tetramethyll ,4-dioxaspiro{4.5 ]decane. 8-allyl-8-aza-7,7.9,9-tetramethyl-l ;4-dioxa-spiro[4.5 ]decane. 8-aza-8-7.7,9,9-tetramethyll ,4-dioxa-8-( 2-propynyl spiro[4.5]decane. Y

8-aza-7.7,9,9-tetramethyl-8-(-p-methylbenzyl)-1,4-dioxaspiro[4.5 ]decane.

v S-(p-chlorohehzyl)-8-aza-7,7,9,9-tetramethyl-l.4-dioxaspiro[4.5]decane. I i I,2',2,6,6-pentamethyl-4,4-(o-phenylenedioxy) piperidine.

-Continued pound ll,2,2,(),(i-pcnlamclhylpipcridinc)-4spim-2-( l ,3', l, l2letraoxacyclooctadccanc)-l l'-spiro-4"-( l", 2". 2". 6", 6"-pentamethylpiperidine). B-(fi-acetoxyethyl)-8-aza-7,7,9,9-tetramcthyl-l ,4-dioxaspiro[4.5]decane. 8-aza-8-(B-decanoyloxyethyl)-7,7,9,9-tctrumcthyl-l.4-dioxuspiro[4.5]decane.

S-(B-acryloyloxyethyl )-8-azu-7,7,9,9.-tetrumethyll .4-dioxaspiro[4.5]decane.

8-aza-8-(,B-crotonoyloxyethyl )7,7,9.9-tetramethyll ,4-dioxaspiro[4.5]decane. 8-aza-(B-benzoyloxyethyl)-7,7,9,9-tetrumethyl-l ,4-dioxaspiro[4.5]decane.

In another aspect of this invention, there is provided a process for the preparation of the N-substituted piperidine compounds of the above formula (I).

More specifically, the present process includes four specific embodiments, that is:

Process A an embodiment for preparing the N- substituted piperidine compounds (l-a) Process B an embodiment for preparing the N- substituted piperidine compounds (l-b) Process C an embodiment for preparing the N- substituted piperidine compounds (I-c) Process D an embodiment for preparing the N- substituted piperidine compounds (l-d). The present process as depicted above can be illustrated in the following reaction schema and each embodiment will be fully discussed herein below:

R (II) O O H1O J CHJ H30 f CH3 H R X R s0 (fin y 0%) 4 \\O/ r/ R5 R1 Ra f f F 0 o o o o o mo CH: m0 CH3 moQcm 1130 f CH: H3O T CH3 HQC T on.

Rt Ra CHzCHzOH Process B Process C reactive derivative of a carboxyllc acid R; C O 0 H I-d) Process D In the above formulae, R represents an alkylene group having two or three carbon atoms, o-phenylene group or the group of the formula in which n is an integer of 4 through 6 inclusive, X represents a halogen atom and R R R R R R and R are as defined above. Process A In this embodiment, the N-substituted piperidine compounds of the formula (I-a) are prepared by reacting the piperidinespiro-cyclic ketal derivative (II) with the halide (lll). The reaction may be suitably effected in the presence of a non-aqueous organic solvent. Examples of the solvent include aromatic hydrocarbons, e.g., benzene, toluene and xylene. The reaction temperature is not critical in this reaction, but the reaction may be usually and preferably conducted at room temperature or a reflux temperature of the reaction solvent LII employed. The reaction period is also not critical, but the reaction is usually completed in about 1 hour to 3 days. The reaction may be more favourably conducted with the addition of an acid-binding agent to remove anacid formed in situ during the reaction proceeding. Examples of the acid-binding agent include inorganic bases, e.g., sodium carbonate and organic bases having ahigher basicity than that of the starting amine (ll), e.g., trimethylamine, triethylamine, methylmorpholine and methylpiperdine. After completion of the reaction, the desired product may be easily recovered and purified by a conventional method, for instance, by filtering off a hydrogen halide by-product as a salt of the starting amine (II) or the base incorporated, concentrating the filtrate and recrystallizing the residue from a suitable solvent. Process B In this embodiment, the N-substituted piperidine compounds of the formula (l-b) are prepared by reacting the piperidine-spiro-cyclic ketal derivative (II) with the sulfate (IV), preferably in the presence of a solvent and an inorganic base. Examples of the solvent include lower alchols, e.g., methanol and ethanol; cyclic ethers, e.g., dioxane; cyclic hydrocarbons, e.g., cyclohexane; water; and the mixture thereof. Examples of the inorganic base include sodium hydroxide and potassium hydroxide. The reaction temperature is not critical, but the reaction is usually effected at room temperature or under heating. The reaction period is also not critical, but thereaction is usually completed in about 2 to 6. hours. After completion of the reaction, the desired product maybe easily recovered and purified by a conventional method, for instance, by distilling off the solvent, extracting the residue with a suitable organic solvent, e.g., benzene or ether and distilling off the solvent from the extract. Process C In this embodiment, the N-substituted piperidine compounds of the formula (1-0) are prepared by reactethylene oxide. The reaction may be preferably effected by dissolving the starting material (II) in an organic solvent, adding a small amount of an acid to the resulting solution, incorporating ethylene oxide into the mixture and heating in a sealed reaction vessel. Examples of the organic solvent include lower alcohols, e.g., methanol and ethanol; cyclic ethers, e.g., dioxane; and the like. Examples of the acid include mineral acids, e.g., hydrochloric acid; organic sulfonic acids,

e.g., methanesulfonic acid, benzenesulfonic acid and p-toluenesulfonic acid; and the like. The reaction temperature is not critical in this reaction, butthe reaction is usually effected at about 50 to 80 C. The reaction period is not also critical, but the reaction is usually I .completed in about 2 to 6'h'ours. After completion of the reaction, the desired product may be easily recovered and purified by a conventional method, for instance, by employing the same procedures as set forth in the above Process B.

Process D In this embodiment, the N-substituted piperidine compounds of the formula (I-a') are prepared by reacting the N-substituted piperidine compounds of theformula (l-c) as prepared in the above Process C with the reactive derivative of the carboxylic acid (V). The reaction in this embodiment is a conventional acylation I reaction and the procedures and conditions in this embodiment may be, accordingly, the same as ordinarily available in the art for such a purpose. The reaction may be preferably effected by dissolving the starting material (I-c) in an organicsolvent, e.g., benzene, adding an inorganic base, e.g., potassium carbonate and then the reactive derivative to the resulting solution and heating under reflux the resultin'gmixture with stirring for about l to 3 hours. After completion of the re;

action, the desired productmay be easily-recovered and purified by a conventional method, for instance, by washing the reaction mixture with water, drying, distilling off the solvent and recrystallizing the residue from a suitable solvent."

The piperidinerspiro-cyclic ketal derivatives (11) which may be employed as a startingmaterial in the process of thisv invention are new substances and they may be readily prepared by reacting triacetonamine with a dihydric alcohol orphenol having .the formula R-(OH) wherein R. is as defined above in the presence of an acid catalyst, e.g., hydrochloric acid, polyphosphoric acid, methanesulfonic acid,,benzenesul-,

fonic acid and p-toluenes'ulfonic acid (See, our Japanese Patent Application No. 44418/ 1969, filed on June 6, 1969).

t In still another aspect of this inventiom there is pro 'vided Ia synthetic I polymer composition stabilized against photoand thermal-deterioration which con-;

tains'at least'one "of the new N-substituted piperidine derivatives (I) having incorporated therein. 1

tives (I) employed in the synthetic polymer in accordance with the present invention may be varied widely, depending upon. the types, priperties and particular uses of the synthetic polymer to be stabilized. In general, the N-substituted piperidine derivatives of the formula (I) may be added in an amount ranging from 0.01 to 5.0 percent by weight, based on the amount of the synthetic polymer, but the practical range is varied de pending upon the type of the synthetic polymer, that is 0.01 to 2.0 percent by weight, preferably 0.02 to 1.0 percent by weight for polyolefins, 0.01 to 1.0 percent by weight, preferably 0.02 to 0.5 percent by weight for polyvinyl chloride and polyvinylidene chloride, and 0.01 to 5.0 percent by weight, preferably 002 to 2.0 percent by weight for polyurethanes and polyamides.

The present stabilizer may be used alone or in combination with other known antioxidants, ultraviolet absorbents, fillers, pigments and the like.

If desired, two or more of the present stabilizers, i.e., the N-substituted piperidine derivatives of the formula (I) may also be satisfactorily used in this invention.

In order that the invention may be better understood, the following Examplesare given solelyfor the-purpose of illustration of this invention. Inthe Examples, all parts are given by weight unless otherwise indicated and the number of the test compound as used hereinbe: low is the same as illustratively shown above.

Examples 1 through ll'describe the preparation of new N-substituted piperidine compounds '(I) of this invention. I

Examples 12 through '17 describe the synthetic polymer composition having incorporated therein the N- substituted piperidine compounds (I) of this invention as well as their stabilizing effects. I

Preparations 1 through 3 describe the preparation of v 8-Aza-7,7,8,9,-pentamethyl?l ,4-di oxa- 1 The N-substituted piperidine derivatives'll) employed as a stabilizer "in the present invention ,may be readilyinc'orporated into the synthetic polymers by any of the various standard procedures commonly. utilized in the art. The stabilizer may be incorporated into the,

synthetic polymers at any desired stage prior to the manufacture of shaped articles therefrom. Thus, for example, thezstabilizei in the formof a-dry powder may be admixed with'the synthetic polymenor a suspension or emulsion of the stabilizer may be admixed witha so- A mixture of 40 g. of 8-aza-7,7,9,9-tetramethyl-1,4- dioxa-spiro[4.5]decane and 2 8.4 g. of methyl iodide was heated under refiuxfor 1 hour. v I I After cooling, therea ction mixturewas filtered to separate out the hydroiodidecrystals' precipitated insitu. The crystals were washedwith ether.

The ether washings andthe filtrate were'combined and the resulting mixture was subjected to distillation under reduced pressure to give 1'5 g. of the desired product as colorless liquid boilingat 91 C./2

minI-Ig. The oily, liquid thus producedyvas ice-cooled to give white crystals melting at '35.5 36? C. Analysis CI2HZ3INOZI I t A t Calculated: c, 67.56%;H,f1-0.87%;'N, 6.45%.

Found: C,'67.20%; H, 10.86%; N, 6.08%. Mass spectrum: Calculated molecular weight NMR spectrum '(in CCl solution):. I

1 6.15 (41-1, cu,'- at 2-1- and 3-"positions),

8.42 (4H, CH at 6- and l-positions), 8.89 (12H, CH at 7- and 9-positions). Following the substantially same procedures as shown above, there was produced 9-aza-8,8,9,10,10- pentamethyll ,5-dioxa-spiro[ 5.5 ]undecane.

bp'. 85 89C./2 mmHg. Analysis for C H NO Calculated: C, 68.68%; H, 11.08%; N, 6.16%. Found: C, 68.51%; H, 10.99%; N. 6.35%. Mass spectrum: Calculated molecular weight EXAMPLE 2 1- 7.78 (3H, singlet,

NCHa)1 8.42 (4H, multiplet, Cl-l at 6- and 10- positions),

8.78 (3H, doublet, J 6 cps, -CH at 2- position),

8.92 (12H, singlet, CH;, at 7- and 9-positions) EXAMPLE 3 8-Aza-7,7,9,9-tetramethyl-8-octyl-1,4-dioxaspiro[4.5]decane A mixture of 40 g. of 8-aza-7,7,9,9-tetramethyl-l,4- dioxaspiro[4.5]decane and 29 g. of octyl bromide was heated at 170 180 C. for 8 hours. After cooling, the reaction mixture was treated in the same manner as shown in the above Example 1 to give the desired product as colorless liquid boiling at 161 162 C./1 mmHg.

Analysis for C ,,H;,, NO

Calculated: C, 73.26%; H, 11.97%; N, 4.50%. Found: C, 74.07%; H, 12.16%; N, 4.47%. Mass spectrum: Calculated molecular weight 31 1. M 31 l. (in CC], solution): 7.5 7.8 (2H. broad, NCH-,), 11.73 (12H, -4(H,).. .11 (JH. ((H-,);-(H,,)

NMR spectrum EXAMPLE 4 shown in the above Example 1 to give the desired product as colorless liquid boiling at 126 128 C./3 mmHg.

Analysis for C H NO Calculated: C, 70.25%; H, 10.53%; N, 5.85%. Found: C, 70.03%; H, 10.61%; N, 5.99%. Mass spectrum: Calculated molecular weight 8-Aza-7,7,9,9-tetramethyl-8-(2-propynyl)-1,4dioxaspiro 4. 5 ]decane To a solution of 20 g. of 8-aza-7,7,9,9-tetramethyl- 1,4-dioxa-spiro[4.5]decane in 50 ml. of benzene were added 24 g. of propargyl bromide and 15 g. of potassium carbonate and the resulting mixture was heated under reflux with stirring for 1.5 hours.

After cooling, the reaction mixture was filtered and the filtrate was concentrated. The residue was subjected to distillation under reduced pressure to give the desired product as colorless liquid boiling at 104 C./1 mmHg.

Analysis for C H NO Calculated: C, 70.85%; H, 9.77%; N. 5.90%. Found: C, 70.63%; H, 9.89%; N, 5.97%. IR spectrum (liquid film): 1 5c 3350 CID-1, zaa clllqcmis- NMR spectrum (in CCl solution):

55-05 (111, T9 19 1); Mass spectrum: Calculated molecular weight EXAMPLE 6 8-Aza-8-benzyl-7,7,9,9-tetramethyl-1,4-dioxaspiro[4.5 ]decane A mixture of 40 g. of 8-aza-7,7,9,9-tetramethyl-1,4- dioxa-spiro[4.5]decane and 17.1 g. of benzyl bromide was heated at 1 10 C. for 7 hours. After cooling, the reaction mixture was treated in the same manner as shown in the above Example 1 to give 29.9 g. of the crystalline residue, which was then recrystallized from petroleum benzine to give the pure desired product as white crystals melting at 101 102 C. Analysis for C H NO Calculated: C, 74.70%; H, 9.40%; N, 4.84%.

Found: C 74.67%; H, 9.21%; N, 4.87%. Mass spectrum: Calculated molecular weight 289. M 289. NMR spectrum (in CO. solution) 1- 2.60 2.97 (5H, C.,H

\NCH2- and CH at 2- and 3-positions).

Following the substantially same procedures as shown above, the following compounds were produced: 8-Aza-8-(p-methylbenzyl )-7,7 ,9,9-tetramethyl- 1 ,4- dioxaspiro[4.5]decane;

White crystals melting at 128 129 C.

[recrystallization from a mixture of methanol and benzene (3:1)].

Analysis for C, H ,,NO

Calculated: C, 75.20%; H, 9.63%; N, 4.62%.

Found: C, 74.90%; H, 10.11%; N, 4.86%. Mass spectrum: Calculated molecular weight 303. M 303. NMR spectrum (in CCl, solution):

T 2.75 (2H) and 3.04 (21-1) -C.,H,),

NCH2),

7.73 (3H, singlet,

8-Aza-8-(p-chlorobenzyl)-7,7,9,9-tetramethyl-1,4- dioxaspiro[4.5]decane;

White crystals melting at 125 126 C. [recrystallization from petroleum benzine]. Analysis for C H NO Clz Calculated: C, 66.76%; H, 8.09%; N, 4.32%. Found: C, 66.60%; H, 7.92%; N, 4.52%. Mass spectrum: Calculated molecular weight 323. M 323. NMR spectrum (in CC], solution):

1' 2.65 (2H) and 2.85 (2H) (C,,H,),

EXAMPLE 7 1,2, 2,6,6-Pentamethyl-4,4-(o-phenylenedioxy)piperidine A mixture of 8.3 g. of 2,2,6,6-tetramethyl-4,4-(- phenylenedioxy)piperidine, g. of methyl iodide and 5 ml. of ether was stirred at room temperature for 2 days.

Then, the reaction mixture was filtered to separate out the hydroiodide crystals precipitated in situ. The crystals were washed with ether.

The ether washings and the filtrate were combined and from the resulting mixture was distilled off the solvent. The residue was chromatographed by means of an alumina column and petroleum ether as an eluent. The eluate so obtained was concentrated to give 3.3 g. of the desired product as white crystals melting at 46 47 C.

Analysis for C H NO Calculated: C, 73.53%; H. 8.87%; N, 5.36%.

Found: C, 73.73%; H, 8.94%; N, 5.30%. Mass spectrum: Calculated molecular weight NMR spectrum (in CCl, solution):

1' (i -l )1 7.70 (3H, singlet,

8.81 (12H, singlet, Cl-l at 2- and 6- positions).

EXAMPLE 8 (1,2,2,6,-Pentamethylpiperidine)-4-spiro-2'- 1 ,3',10,12'-tetraoxacyclooctadecane)-1 1-spiro-4- 1 ",2",2",6",6"-pentamethylpiperidine) A mixture of 1.5 g. of (2,2,6,6-tetramcthylpiperidine)- 4-spiro-2-('1,3',10,12'-tetraoxacyclooctadecane)- 1 l"-spiro-4-(2,2",6",6"-tetramethylpiperidine), 5 g. of methyl iodide and 200 ml. of benzene was heated under reflux for 25 hours. After cooling, the reaction mixture was treated in the same manner as shown in the above Example 1 and the crystalline residue recrystallized from methanol to give the desired product as white crystals melting at 204 208 C. AnalySiS for C32HG2NQO4I Calculated: C, 71.32%; H, 11.60%; N, 5.20%.

Found: C, 71.16%; H, 11.43%; N, 5.42%. Mass spectrum: Calculated molecular weight 538. M 538. NMR spectrum (in CCl, solution):

7 7.73 (6H, singlet,

N-CHa) 8-Aza-7,7,8,9,9-pentamethyll ,4-dioxaspiro[4.5]decane To a solution of 20 g. of 8-aza-7,7,9,9-tetramethyll,4-dioxa-spiro[4.5ldecane in 100 ml. of cyclohexane was added 60 ml. of an 50 percent aqueous sodium hydroxide solution and to the resulting mixture was added dropwise with stirring 12.6 g. of dimethyl sulfate. After completion of the dropwise-addition, the resulting mixture was stirred at room temperature for additional 4 hours. Then, the solvent was distilled off, the residue was extracted with benzene and the benzene extract was subjected to distillation under reduced pressure to give the desired product as colorless liquid boiling at 91 C./2 mmHg. The product thus obtained is identified with that in the above Example 1 by means of melting point, analysis, IR spectrum, NMR spectrum and mass spectrum.

EXAMPLE l0 8-Aza-8-( B-hydroxyethyl )-7,7,9,9-tetramethyll ,4- dioxaspiro[4.5]decane A methanolic solution of 8 g. of 8-aza-7,7,9,9- tetramethyl-l ,4-dioxa-spiro[4.5ldecane, 0.4 ml. of hydrochloric acid and 20 g. of ethylene oxide were sealed 1 15 C/Z mmHg.. which was ice-cooled to give white crystals melting at 52 53 C. Analysis for C,;,H NO

Calculated: C, 64.16%; H. 10.36%: N, 5.76%

Found: C, 64.22%; H, 10.18%; N, 5.80%. Mass spectrum: Calculated molecular weight 243. M 243. NMR spectrum (in CCl. solution):

1' 6.60 (2H, triplet,

7.35 (2H, triplet,

7.48 (1H, broad, OH).

EXAMPLE 1 l leum ether to give the desired product as white crystals melting at 35 36 C.

Calculated: 63.13%; H. 9.54%; N. 4917!. Found: C. 63.33%; H. 9.62%; N. 4.99%. IR spectrum (Nujol mull): 1748 cm" Mass spectrum: Calculated molecular weight Following the substantially same procedures as shown above, the following esters were produced: 8-aza-8-( ,B-decanoyloxyethyl )-7,7.9,9-tetramethyl-1 ,4-

' dioxaspir[4.5]decane:

Colorless oily substance boiling at 178 180 C./0.l5 mmHg.

Analysis for C H NO Calculated: C. 69.84%; H. 10.9092; N. 3.52%. Found: C. 70.10%; H. 10.94%; N. 3.69%. IR spectrum liquid film): 11,-, 1740 cm.

Calculated molecular weight 397. M 397.

Mass spectrum:

8-(B-acryloyloxyethyl)-8-aza-7,7,9,9-tetramethyl-l ,4- dioxaspiro[4.5]decane;

Colorless oily substance boiling at 143 144 C./1 mmHg. 7

Analysis for C||;H NO,,:

Calculated: C. 64.62%; H. 9.15%; N. 4.71%. Found: C. 64.34%; H. 9.17%; N. 4.6271. IR spectrum (liquid film): 11 1735 cm. Mass spectrum: Calculated molecular weight 14 8-aza-8-(,B-crotonyloxyethyl)-7,7,9.9-tetramethyl-1,4- dioxaspiro[4.5 ]decane;

Colorless oily substance boiling at 163 165C./ 1 mmHg.

Analysis for C ,-H ,,NO

Calculated: C. 65.56%; H. 9.39%; N. 4.50%. Found: C. 65.28%; H. 9.40%; N. 4.49%. IR spectrum (liquid film): w, 1730 cm Mass spectrum: Calculated molecular weight 31 l. M 31 l.

8-aza-8-(,B-benzoyloxyethyl)-7.7,9,9-tetramethyl-1,4- dioxaspiro[4.5]decane;

White crystals melting at 77 78 C.

Analysis for C20 ggNO Z Calculated: C. 69.13%; H. 8.41%; N. 4.03%. Found: C, 69.22%; H. 8.45%; N. 3.99%. Mass spectrum: Calculated molecular weight EXAMPLE 12 Into 100 parts of polypropylene [Noblen .lHH-G,

: trade name, available from Mitsui Toatsu Chemicals Inc., Japan, employed after twice recrystallizations from monochlorobenzene] was incorporated 0.25 part of each of the test compounds of this invention indicated below. The resulting mixture was mixed and melted and then molded into a sheet having a thickness of 0.5 mm. under heating and pressure.

As a control, the polypropylene sheet was prepared in a similar manner to that described above without any of stabilizers for comparative purpose.

Then, all of these sheets thusformed were tested for the brittleness time (which means the time. expressed in terms of hour, until the test sheet will'become brittle) under ultraviolet ray irradiation at a temperature of 45 C. by means of the fade meter prescribed in Japanese Industrial Standard JlS-1044 entitled Testing Method of Color Fastness to Light of Dyed Textiles and Dyestuffs, Paragraph 3.8 (in English).

The results are given in the following Table 1.

Table 1 Test compound No. Brittleness time (hours) EXAMPLE 13 Into parts of high-density polyethylene [Hi- Zex, trade name, available from Mitsui Toatsu Chemicals Inc., Japan, employed after twice recrystallizations from toluol] were incorporated 0.25 part of each of the test compounds of this invention indicated below. The resulting mixture was made into a sheet by the same procedure as in the above Example 12.

The sheet thus formed was tested for the brittleness time by the same test method as in the above Example 12. The results are given in-the following Table 2.

Table 2 Test compound No. Brittleness time (hours) EXAMPLE '14 Into 100 parts of 6-nylon [CM 1011, trade name, available from Toray Industries Inc., Japan, containing no stabilizer] was incorporated 0.25 part of each of the test compounds of this invention indicated below. The resulting mixture was heated and melted and then molded into a film having a thickness of about 0.1 mm.

under pressure. The film thus formed was aged under Table 3 Test Fade meter Gcers aging com- (after 300 hours) tester pound (2. hours. 160C.)

Retention Retention Retention I Retention of ultimate of ultimate of ultimate of ultimate elongation tensile elongation tensile (7r) strengtht7l) .(7:) strengthtk) 6 60 59 58 56 8 51 V53 48 51 l l l 61 65 60 59 I3 57 53 51 S9 14 62 57 63 62 l5 59 57 61 55 16 55 55 54 5] i7 59 61 50 52 None 8 4O 9 52 EXAMPLE 15 Into 100 parts of polyurethane prepared from polycaprolactone [E5080," trade name, available from The Nippon Elastollan Industries Ltd.. Japan] was incorporated 0.5 part of each of the test compounds of this invention indicated below. The resulting mixture was heated and melted and then molded into a sheet having a thickness of about 0.5 mm. The sheet thus formed was subjected to the exposure to ultraviolet ray for 15 hours in the fademeter as specified in the above Example 12 at 45 C. and then tested for the retentions of ultimate elongation and ultimate tensile strength as in the above Example 14.

The results are given in the following Table 4.

Into 100 parts of polyvinyl chloride [Geon 103 EP, trade name, available from The Japanese Geon Co. Ltd., Japan] were incorporated.l.0;part of lead stearate, 0.5 part of dibasic lead phosphite, 0.5 part of barium stearate, 0.5 part of cadmium stearate and 0.2 part of each of the test compounds of this invention indicated below. The resulting mixture was" blended and kneaded for 4 minutes on a kneading roll at 180 C. and then formed into a sheet having a thickness of about 0.5 mm. The sheet was tested for the discoloration degree thereof by the aging test method set forth below.

Aging test I 1. Exposure to the sunshine carbon apparatus prescribed in Japanese Industrial Standard JIS Z-0230 entitled Accelerated Weathering test of Rust Proofing Oils, Paragraph 2 for 600 hours.

2. The sheet was aged for minutes at 170 C. in the Geers aging tester prescribed in the above Example 14. The results are given in the following Table 5.

' Table 5 Discoloration Sunshine carbon Geers aging tester Test compound apparatus (after 90 minutes,

No. (after 600 hours) C 4 Pale yellow Pale yellow 6 do. Yellow 8 Yellow i 4 i do. i I l 1 Slightly yellowish Pale yellow 14 1 Pale yellow i do.

16 Yellow 2 Yellow 17 do. do. None Dark brown Black EXAMPLE l7 Into parts of acrylonitrileebutadiene-styreneresin [ABS-60, trade name, available from The Japan Synthetic Rubber Co. Ltd., Japan] were incorporated 0.5 part of each test compound of this invention indicated below. The resulting mixture was blended and kneaded for 8 minutes on a kneading roll at 160 C. and formed into a sheethaving a thickness of about 0.5 mm. The sheet was exposed for 50 hours in the sunshine carbon apparatus specified in the above Example 16 and then tested for the retentions of ultimate elongation and ultimate tensile strength as in the above Example 14.

The results are given in the following Table 6.

Table 6.

Test compound Retention of Retention of No. ultimate ultimate tensile elongation (71) strength (71) 4 58 l 87 6 57 89 8 57 85 l l 59 88 14 60 86 16 62 89 17 58 87 None 44 79 It will be apparent from the above-described results I that N-substituted piperidine derivatives (1) of this invention show excellent stabilizing effects against deterioration of various synthetic polymers.

Preparation 1 8-Aza-7,7.9,9-tetramethyl-1.4-dioxa-spiro[4.5ldecane 1R (liquid film) v,- 1091. 1040 cm Analysis for H- N Calculated C. 66.29%; H. 10.62%: N. 7.03%.

Found: C. 66.39%; H. 10.7471; N. 6.98%. Molecular weight (Osmometer) Calculated: 119.29

Found: 205.7

Preparation 2 4,4-(o-Phenylenedioxy)-2,2,6.6-tetramethylpiperidine The substantially same procedure as shown in the above Preparation l was repeated except that catechol was employed instead of the ethylene glycol to give the desired product as colorless liquids boiling at 118 120 C./3 mmHg.

Upon being allowed to cool, the liquids solidified and recrystallization from aqueous methanol gave white crystals melting at 74 75 C.

1R (Nujol mull) u,- 1098. 1064 cm Out-of-plane deformation absorption of the o-disuhstituted benzene ring 730 800 cm Analysis for C -,H. ..NO.

Calculated: C. 72.84%; H. 8.56%; N. 5.66%. Found: C. 72.73%; H, 8.71%; N. 5.90%.

Preparation 3 (2,2,6.6-Tetramethylpiperidine)-4-spir0-2 1',3,10',12-tetraoxacyclooctadecane)-1 l -spiro-4- (2",2,6,6"-tetramethylpiperidine) The substantially same procedures as shown in'the above Preparation 1 was repeated except that 62 g. of triacetonamine, 25 g. of hexamethylene glycol and 78 g. of p-toluenesulfonic acid were employed.

After completion of the reaction, the reaction mixture was poured into a cold aqueous solution of sodium hydroxide, the benzene layer was separated and washed with water. After drying over anhydrous sodium sulfate, the solvent was distilled off and the residue recrystallized from methanol to give the desired product as colorless prisms melting at 187 188 C.

Analysis for C ,H ,.N. ,O..:

Calculated: C. 70.5471; H. 11.45%; N. 5.48%. Found: C. 70.37%; H. 11.45%; N. 5.61%. Mass spectrum: Calculated molecular weight 510. M 510. (in CCl, solution):

NMR spectrum 1' 6.64 (8H. CH adjacent to O).

8.38 (8H. singlet. CHg in piperidine ring). 8.60 (16H. broad. -CH- 8.85 (24H. singlet. -CH;,). (liquid film): v,- 1091. 1042 cm".

K N 0 Q HaC CH3 wherein R represents alkyl of 1-8 carbon atoms, alkenyl of 3-5 carbon atoms, alkynyl of 3-5 carbon atoms, aralkyl of 6-10 carbon atoms in the aryl moiety and 1-3 carbon atoms in the alkyl moiety, B-hydroxyethyl or the group of the formula in which R represents alkyl of 1-10 carbon atoms, a1- kenyl of 3-5 carbon atoms or aryl of 6-10 carbon atoms; and R represents alkylene having two or three carbon atoms, o-phenylene or the group of the formula CH; 0113 on; on;

in which I in which R; is as defined above and n is an integer of R, is as defined above and n is an integer of4 through 4 through 6 inclusive; 6 inclusive and wherein said synthetic polymer is 10 a compound having the formula selected from homopolymers of olefms, copolymers of olefins with other ethylenically unsaturated monomers, vinyl chloride homopolymers, vinylidene chloride homopolymers, vinyl chloridevinylidene chloride copolymers, copolymers of vinyl chloride or vinylidene chloride with vinyl ace- H30 CH3 tate or other ethylenically unsaturated monomers, polyacetals, polyesters, polyamides having recuring N CH3 amide groups as integral parts of the main polymer mCmOH (H) chain and polyurethanes.

2. A synthetic polymer composition according to claim 1 wherein said compound (l) is a compound having the formula wherein R represents alkylene having two or three carbon atoms, o-phenylene or the group of the formula CH; CH; 2)n 1130 CH; N-CHzOHaOH (cH,),.o H 0 f e11a CH3 an wherein R represents alkyl of 1-8 carbon atoms, alkenyl of 3-5 carbon atoms, alkynyl of 3-5 carbon atoms in which n is an integer of 4 through 6 inclusive; or aralkyl of 6-10 carbon atoms in the aryl moiety and or l-3 carbon atoms in the alkyl moiety; and R reprea compound having a formula sents alkylene having two or three carbon atoms, 0- phenylene or the group of the formula KB CH: CHa (CH:)n

NR| mo. cm 2)n on; on, me N on,

JIHQCHtO Ra (l d) in which R is as defined above and n is an integer of 4 through 6 inclusive, wherein R represents alkyl of 1-8 carbon atoms, al-

a compound having the formula kenyl of 3-5 carbon atoms or aryl of 6-10 carbon atoms; and R represents alkylene having two or three carbon atoms, o-phenylene or the group of the formula wherein R represents alkyl of l- 8 carbon atoms; in which R;; is as defined above and n is an integer of and R represents alkylene having two or three carbon 4 through 6 inclusive. atoms, o-phenylene or the group of the formula 3. A synthetic polymer composition according to claim 1 wherein said compound (I) is incorporated in an amount of 0.01 5.0 percent by weight, based upon the amount of the synthetic polymer.

4. A synthetic polymer composition according to claim 1 wherein said polymer is a homopolymer of olefins or a copolymer of olefins with other ethylenically unsaturated monomers.

5. A synthetic polymer composition according to claim 1 wherein said polymer is a vinyl chloride homopolymer, vinylidene chloride homopolymer, vinyl chloride-vinylidene copolymer. or a copolymer of vinyl chloride or vinylidene chloride with vinyl acetate or other ethylenically unsaturated monomers.

6. A synthetic polymer composition according to claim 1 wherein said polymer is a polyurethane.

7. A synthetic polymer composition according to claim 1 wherein said polymer is a polyamide having recurring amide groups as integral parts of the main polymer chain.

8. A synthetic polymer composition according to claim 1 wherein said polymer is acrylonitrilebutadiene-styrene copolymer.

9. A synthetic polymer composition according to 11. A synthetic polymer composition as claimed in claim 2, wherein R is'aralkyl, the aryl moiety of which is substituted by alkyl of one to three carbon atoms or halogen. 

1. A SYNTHETIC POLYMER COMPOSITION STABILIZED AGAINST PHOTO- AND THERMAL-DETERIORATION WHEREIN THERE IS INCORPORATED, IN A SUFFICIENT AMOUNT TO PREVENT SAID DETERIORATION, A COMPOUND HAVING THE FORMULA
 2. A synthetic polymer composition according to claim 1 wherein said compound (I) is a compound having the formula
 3. A synthetic polymer composition according to claim 1 wherein said compound (I) is incorporated in an amount of 0.01 - 5.0 percent by weight, based upon the amount of the synthetic polymer.
 4. A synthetic polymer compOsition according to claim 1 wherein said polymer is a homopolymer of olefins or a copolymer of olefins with other ethylenically unsaturated monomers.
 5. A synthetic polymer composition according to claim 1 wherein said polymer is a vinyl chloride homopolymer, vinylidene chloride homopolymer, vinyl chloride-vinylidene copolymer, or a copolymer of vinyl chloride or vinylidene chloride with vinyl acetate or other ethylenically unsaturated monomers.
 6. A synthetic polymer composition according to claim 1 wherein said polymer is a polyurethane.
 7. A synthetic polymer composition according to claim 1 wherein said polymer is a polyamide having recurring amide groups as integral parts of the main polymer chain.
 8. A synthetic polymer composition according to claim 1 wherein said polymer is acrylonitrile-butadiene-styrene copolymer.
 9. A synthetic polymer composition according to claim 1 wherein said compound (I) is selected from the group consisting of 8-aza-8-( Beta -hydroxyethyl)-7,7,9,9-tetramethyl-1,4-dioxa-spiro(4.5)decane, 8-aza-8-benzyl-7,7,9,9-tetramethyl-1,4-dioxa-spiro(4.5)-decane, 1,2,2,6,6-pentamethyl-4,4-(o-phenylenedioxy)piperidine, 8-aza-8-( Beta -decanoyloxyethyl)-7,7,9,9-tetramethyl-1,4-dioxa-spiro(4.5)decane, and 8-( Beta -acryloyloxyethyl)-8-aza-7,7,9,9-tetramethyl-1,4-dioxa-spiro(4.5)decane.
 10. A synthetic polymer composition as claimed in claim 1, wherein R1 is aralkyl, the aryl moiety of which is substituted by alkyl of one to three carbon atoms or halogen.
 11. A synthetic polymer composition as claimed in claim 2, wherein R1 is aralkyl, the aryl moiety of which is substituted by alkyl of one to three carbon atoms or halogen. 